>>reporter: the director of uc berkeley california energy institute feels more regulation is not the answer. instead his creative solution is to allow california to buy some of the dirty gas the rest of the country uses during the peak summertime months. put surcharge on it and use to it buy-back most polluting cars from the pre-19 sphinx era. in san francisco, abc 7 news. >>> in a sense san francisco base twitter on the front-lines in the latest middle east conflict. is israeli military announced military campaign against the palestinian group hamas by twitter. s israeli defense forces are live twee tweeting and bloging about the operation in gaza. hamas also responding on line. gaza and hamas are the primary hash tag. >> tension in the middle east is escalating tonight as the possibility of all out war is increasing. many [ siren]. >> sirens went off short time nag tel aviv. alex is on the front-lines in gaza city. >> very loud explosions all around us tonight as israeli missiles land. we have also heard the distinct whoosh of outgoing rocket and hamas and other militant group retu